As penis size is a huge topic of anxiety for a lot of men, most want to know how they measure-up down below.

In the latest craze, self-conscious blokes in Japan are sticking their penises in the cardboard inner tube of a toilet roll.

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NEW TREND: Men in Japan are using toilet roll to calculate their penis size

This technique isn’t new, but it has suddenly grown in popularity after a tweet from @urashahou, where he shared diagrams of the crazy method along with a guide on how to do it.

The idea is, it’s a way of judging the size of your manhood without the use of a ruler or tape measure.

It’s simple, all you do is stick it into the tube and see how much emerges from the other end.

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If the head of the penis does not protrude from the far end of the core, sadly this means your schloong is on the smaller side.

But if 2cm or less of the penis pokes out, you have an average size penis. If more of the head of your manhood extends beyond the surface then it means you're well endowed.

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